Modular cage system

Abstract

Disclosed are devices for the fixation and support of vertebrae, particularly spinal implant devices formed from modular components of different materials.

1 . A modular implant device for the spine, the modular implant device for location between two adjacent vertebrae, comprising:
 a first member sized to span a distance between the two adjacent vertebrae, the first member including a first upper engagement surface for engaging a first lower endplate portion of a first vertebral body of the two adjacent vertebrae and a first lower engagement surface for engaging a first upper endplate portion of a second vertebral body of the two adjacent vertebra, the first member formed from a first material;   a second member sized to span the distance between the two adjacent vertebrae, the second member including a second upper engagement surface for engaging a lower endplate of a first vertebral body of the two adjacent vertebrae and a second lower engagement surface for engaging an upper endplate of a second vertebral body of the two adjacent vertebrae, the second member formed from a second material, the first material being different from the second material; and   the first member further comprising a first opening extending from the first upper engagement surface to the first lower engagement surface;   wherein the second member is sized and configured to fit inside of the first opening.   
     
     
         2 . The modular implant device of  claim 1 , wherein a first distance between the first upper engagement surface and the first lower engagement surface equals a second distance between the second upper engagement surface and the second lower engagement surface. 
     
     
         3 . The modular implant device of  claim 1 , wherein when the second member is inside of the first opening, the first and second upper engagement surfaces are coplaner. 
     
     
         4 . The modular implant device of  claim 1 , wherein when the second member is inside of the first opening, the first and second lower engagement surfaces are coplaner. 
     
     
         5 . The modular implant device of  claim 3 , wherein when the second member is inside of the first opening, the first and second upper engagement surfaces are coplaner. 
     
     
         6 . The modular implant device of  claim 1 , wherein the first member comprises titanium and the second member comprises silicon nitride. 
     
     
         7 . The modular implant device of  claim 1 , wherein the second member comprises titanium and the first member comprises silicon nitride. 
     
     
         8 . The modular implant device of  claim 1 , further comprising:
 a third member sized to span the distance between the two adjacent vertebrae, the third member including a third upper engagement surface for engaging a lower endplate of the first vertebral body of the two adjacent vertebrae and a third lower engagement surface for engaging an upper endplate of the second vertebral body of the two adjacent vertebrae; and   the second member further comprising a second opening extending from the first upper engagement surface to the first lower engagement surface;   wherein the third member is sized and configured to fit inside of the second opening.   
     
     
         9 . The modular implant device of  claim 8 , wherein the first, second and third members each comprise a locking opening, and the first, second and third members are secured together by a locking pin extending through the locking openings in the first, second and third members.